Press



1930- O.'DRECHSLER 1,748,063

PRESS 7 Filed March's, 1926 I Z Sheets-Sheet 1 Fig. 1.

/4 a n o 0 Ml} W Wm I! ('[WWdlflfi 54 la y \W[ E y/1 1 a} [0 fig" AINVENTUR 7 Feb.- 25, 1930. Q o. DRECHSLER PRESS -Filed March 6, 1926 2Sheets-Sheet 2 Patented Feb. 25, 1930 warren STATES PATENT OFFICEOTTODRECHSLER, F SOSSENHEIM, GERMANY, ASSIGNOR TO UNITED SHOE MACHINERYCGRPORATION, 0F PATERSON, NEW JERSEYYA CORPORATION OF NEW JERSEY rnnssApplication filed March 6, 1928, Serial No. 92,879, and in GermanyApri1'9, 1925.

This invention relates to improvements in presses and, moreparticularly, to presses of the typeemployed in dieing out blanks fromsheet material such as leather. 5" In the construction of machines fordieing "out blanks such as shoe part blanks from sheet material it'hasbeen common to make some provision for lessening the possibility ofinjury to the operator. To this end, some machines of the type referredto, in which a Ipresser member for forcing a die through the material,and a work support are arranged for relative movement, have been soconstructed that preliminary movement of the I '15 presser vmembertoward the work support Just be effected before a poweroperation of themachine can take place, the presser member being moved into suchposition that the operator cannot throw in the power drive 3 while hishand is between the die" and the presser member or between the die andthe work support. 7 i

This preliminary movement or safety stroke of the presser member hasbeen, effected by means of'a treadle'or other controlling member foroperating the power drive, the usual construction being such that thepreliminary movement. of the presser memher is effected by the firstpart of the move- 0 ment of the treadle, the parts being so arrangedthat the treadle. is not efiective to throw in the power drive until thepreliminary movement of the presser member has been completed. Inmachines embodying the safety feature above referred to some formoflmechanismis required for connecting the presser member to the powerdrive eats the preliminary movement in order to eifect dieing outoperations. To this end, certain machines have been so constructed thatthe presser member is operated by means of a re ciprocating membermounted on a constantly driven eccentric, the reciprocating member beingmovable into operative position relativel to the resser member b meansof a e y P Y spring rendered eiiective by the treadle after thepreliminary downward movement of the presser member has been eiiected.After the completion of a power operation, the reciproeating member isreturned to lnoperative pofore constructed has been that thereciprocating' members, being of heavy construction,

have relatively large inertia so that their operation by means ofsprings requires considerable time, thus resulting in machines in whichthe speed is limited and in which the operation is uncertain. Also, thereturn of the reciprocating member to inoperative position by means of astop is possible only after the eccentric has moved past dead center. Inmachines of a similartype in which the reciprocating member is returnedto inoperative position by means of springs, the operation of themachines is uncertain and unreiable.

It is 'anobject of the present invention to provide an improved press inwhich the above-mentioned disadvantages are eliminated.

- To this end and in accordance with one feature of the invention, inthe illustrated machine there is provided a reciprocable power member, apresser member, means for effecting a prellmmary movement of the pressermember,novel means comprising a connecting member for coupling the powermember and the presser member for effecting pressure operations of thelatter, and manually controlled means for rendering the connectingmember operative, the construction being such that the connecting membercannot be rendered operative and a pressure operation of the pressermember cannot take place until the connecting member is moved tocoupling position. The connecting member is preferably of lightconstruction so that it will have low inertia and, consequently, willnot slow up the machine. Accordingly, the illustrated member is a lightpawl.

Further to insure safety of operation, another feature of the inventionconsists in novel mechanism for elfecting positive move- Other featuresof the invention will be apparent from the following description takenin connection with the accompanying drawings and will be pointed out inthe appended claims. I

In the drawings,

Fig. 1 illustrates a side view of a embodying the invention;

Fig. 2 shows a part of the machine invertical section;

Fig. 3 is a vertical section taken along line 33 of Fig. 2;

Fig. 4 is a horizontal section taken along line 4-4 of Fig. 2; and

Figs..5, 6 and 7 are views corresponding to Figures 2, 3 and4,'res'pectively, but show certain of the operating elements indifi'erent positions.

The illustrated preferred embodiment of machine the invention comprisesa frame 10 (Fig.1),

a cutting block 12, and a presser member 14 mounted in the frame forreciprocating movement toward and from the cutting block in effectingpressure operations upon a die 16 to produce heel lifts from sheetmaterial 18, such as leather or leather board, supported on the cuttingblock 12.

The presser member 14 is guided vertically in the frame 10 (Fig. 2) bymeans of a head 20 and is actuated by a power shaft 22 which isoperatively connected to the presser member by means comprising a powertransmitting member or ram 24 mounted on the eccentric pivot 26 at theend of the, shaft. -Th'e shaft 22 isadapted to revolve continuously andthrough the pivot 26 imparts an uninterrupted up-and-down movement tothe ram 24. To effect operations of the presser member, a pawl 28,pivoted to a pin 30 on the head 20, is provided. Vhen the ram 24 is inits I upper position the pawl 28 may be swung are depressed.

under the lower end of the ram 24 so that upon the next downwardmovement of the ram 24 the head 20 and presser member 14 In order toensure safety to the operator, manually operated means is provided forcausing a preliminary downward movement of the presser member intocontact with the die, into the position shown by the dotted lines inFig.1, before the ram 24 can be effective in transmitting power to thepresser member 14. To this end, the machine is provided with mechanismfor depressing the presser ram 24 upon actuation of a starting treadle32. Operatively connected to the treadle- 32, by means of a link 34'anda bellcrank 36 is a link 38. The link 38 is provided with anose 40 whichengages with a projection 41 of bell-crank 42 pivoted at 44 and havingrounded end 46 entering a recess 48 in the head 20. \Vhenthe treadle isdepressed, the nose 40 effects a rotation of the bell-crank lever 42 ina counter-clockwise direction into the position shown in Fig. 5, thusforcing the vesoes presser member 14 downwardly into contact with thedie 16, so that the operator cannot.

put his fingers between the presser member and the .die. Simultaneouslywith this movement of the lever 42, a locking device 1s released whichup to that time operates to hold the pawl 28 in its inoperative positionat one side of the ram 24, as shown in Fig. 3.

The locking devicereferred to comprises a the rod 38 and is providedwith a recess in which is engaged one end 54 of the lever 42. i

A spring 56 is provided tending normally to hold the link 38 in raisedposition with the dog 50 locked in engagement with the pawl 28 (Fi s/2and 4). The free end of the rod 38 is positioned in a-recess 58 'ofthehead 20 so that upon downward movement of the presser member, the rod 38is depressed, the dog 50 being withdrawn from engagement with the pawl28, as shown in Figures 5 and 7.

Springs 60 are provided for returning the presser member 14 to raisedposition after a downward movement thereof.

Mechanism is also provided for ensuring that the pawl 28 shall be movedout of its,

position for engagement with the member 24 at the termination of anoperation of the presser member. To this end, the illustrated machine isprovided with a link 62 pivoted to'the pawl 28 and connected to a lever64 pivoted about a fixed axis66. The upper end of the link 62 carries aroll 68-which, by means of a spring 70, is held against a cam 72 mountedat the end of the eccentric pivot 26. The shape of this cam is soselected that'the pawl 28 is moved laterally, immediately after thecompletion of an operative stroke of the presser member, into theposition shown .in Fig. 3. The rain 24 is provided with a slot 7 4adapted to receive the link 62 on subsequent downward movements of themember without efiecting a movement of the link.

The operation of the machine is as follows When the treadle 32 isdepressed, the link 38 is pulled in the direction of the arrow (Fig. 2)so that the nose 40 causes the movement of rotationof the lever 42,which, as stated, effects a lowering of the presser member 14 upon thedie 16. Simultaneously,

through the action of the end'54 of the lever and when the ram 24 nextmoves upwardly out ofthe path of movement of the pawl,

the latter will be swung by means of the spring 70 under the end of theram, as shown in Fig. 6. Upon the next downward stroke 7 of the ram 24,the latter acts upon the upper end of the pawl 28 to effect a furtherdownward movement of the presser member 14, causing the die '16 topenetrate the work 18, thus forming a blank.

Upon,downward movement of the head 20, the upper wall of the slot 58acts upon the ro'd38 and pushes the latter so far downwardly that thenose 40 releases the lever 42. The lever 42 is then turned to the rightby thespring 56and thus does not interfere with the upward movement of"the head. The treadle 32 may be released at anytime during the operationof the machine and is moved upwardly under influence of a spring 76(Fig. 1) without being afiected by the parts Operating to lower thepresser member.

g Y- Asthe ram 24 moves rearwardly, the cam 72 acts uponthe lever 64andswings the pawl QS-again into inoperative position, in

which position it is held by the dog under the influence of the spring56, independently of the movement of the presser member.

; Having thus described my invention,

whatl claim as new and desire to secure by Letters Patent of the UnitedStates is:-

Q 1. In a machine of the class described, a

reciprocable power member, a presser member, means foreffecting apreliminary move "ment of the presserf'member, a connecting member forcoupling the power member and the presser member for 'effectlng pressureoperations of the presser member, said j connecting member beingconstructed and arranged for movement into and out of op- I erativepositionflbetween thepower member and the presser member, and manuallycontrolled means for rendering the connecting necting-member intooperative position,

member; operative.

2. In a machine of the class described, a

reciprocable power member, a presser member, a connecting member movableinto 0perative position between the said members for coupling thepresser member andthe power member, means for moving the conci L meansunder manual controlfor effecting a preliminary movement of the pressermember before the means for moving the connecting member into operativeposition be comes operative.

. v 3.- In a machine of the character described,

a reciprocable power operatedmember, a presser member, a manuallyoperable start ing member, means operable upon actuation of the startingmember for operatively connee-ting .the power member to the pressermember for effecting an actuation of the a presser member,

latter, and means for positively moving the said connecting means intoinoperative position after an actuation of the presser member. v v

4., In a machine of thecharacter described, a pawl pivotally mountedon'the presser member, a shaft, a power 1 member mounted on the shaftand arranged for continuous reciprocation thereby, means formoving thepawl into position between the power member and the presser memberinsuch manner that the power member ber comprising a shaft, a rameccentrically mounted upon the shaft, and a pawl movable into operativeposition between the ram and the presser member, a cam mounted on theshaft, and connections between the cam and the pawl for moving the pawlinto inoperative position. 7

' 6. In a machine of the character described, a ram, a presser member, apawl for opera-' tively connecting the ram, to the presser member, meanstending to move the pawl into operative position, means for normallyretaining the pawl in inoperative position comprising a dog slidablymounted in a slot in the pawl, and means for moving the dog into and outof the slot.

Cit

7 In a machine of the character described,

to the shaft and arranged for continuous reciprocation thereby, a pawlconnected to the presser member, means for moving the pawl intoand outof the path of movement of said ram, the arrangement being such thatwhen thepawl is in the path of the ram the presser member is movedtoward the cutting block, and manually controlled means for moving thepresser member toward the cutting block independently of the operationof the ram.

8. In a machine of the character described, a frame, a cutting block, apresser member mounted for reciprocation toward and from the cuttingblock, a starting treadle, means responsive to the operation of saidtreadle for moving the presser member toward the cutting block, a shaft,a ram mounted on the shaft for reciprocation toward and away from thecutting block, a pawl arranged for movement into position between theram and the presser member, but normally held in position at one side ofthe ram, means responsive to an operation of the treadle for ated memberto the presser member for effecting an operation of the latter, a shaftfor effecting reciprocations of the, power member, manually controlledmeans for moving the pawl into operative position, means controlled fromthe shaft for moving the pawl into inoperative position, and means forlocking the pawl in inoperative position.

10. In a machine of the class described, a shaft, a ram mounted on theshaft and arranged to be continuously reciprocated thereby, a pressermember, a pawl foroperatively connecting the presserf member to the ramfor effecting operations of the presser mem ber, means tendingconstantly to move the pawl into operative position, means operative tomove the pawl into inoperative position after each operation of thep'resser member, and means for locking the pawl in inoperative position.7

11. In a machine of the character described, a work support, a pressermember,

power means for moving the presser member toward the work support butnormally disconnected therefrom, starting means, means responsive to anactuation of the starting means for effecting a preliminary movement ofthe presser member toward the work support, mechanism operative afterthe completion of such movement for effecting an operation of the powermeans upon the presser member to produce a pressure operation upon workcarried by the Support, and means for locking said mechanism ininoperative position after a pressure operation.

12. In a machine of the class described, a shaft, a ram arranged to bedriven continuously by the shaft, a work support, a presser membermovable toward and away from the work support, a connection movable intoposition between the ram and presser' member for eflecting pressureoperations upon a die carried on the work support, a starting member forinitiating a movement of the presser member into contact with the die,and means operable after the presser member has been brought intocontact with the die for moving the connection into operative positionfor effecting a pressure operation of the presser member. r

13; Ina machine of the class described, a shaft, a ram arranged to bedriven continuously by the shaft, a work support, a presser membermovable toward and away from the work support, a connection movable intoposition between the ram and presse'r' member for effecting pressureoperations upon a die carried on the work support, a starting memi herfor initiating a. movement of the presser member into contact with thedie, means operable after the presser member has been brought intocontact with the die for moving the connection into operative positionfor effecting a pressure operation of the presser member, and meansoperative after such imraoes shaft, a power operated membermou'nted forcontinuous reciprocating movement by the shaft, a work support, apresser member movable toward and away from the work support, a manuallycontrollable member c'on- 7' nected to the presser'member and movableinto the path of the power operated member for effecting a pressureoperationof the presser member, -means for normally retaining themanually controllable member in inoperative position, means forinitiating a preliminary movement of the presser member toward the worksupport and simultaneously moving the manually operable member intooperative position, and means operable after the termi- V nation of apressure operation of the presser member for. returning themanuallyoperable member to inoperative position.

15. In a machine of the character described,

a cutting block, a presser member mounted for movement toward and awayfrom the cut ting block, a shaft, a ram mounted on the shaft andarranged for continuous up and down movements with respect to thecutting block, a pawl p'ivotally mounted on the presser member betweenthe member and the ram and movable into position beneath the ram toeffect apressure operation of the ram upon the presser member, a membernormally operative to lock the pawl in inoperative position, a startingtrea'dle, a member operatively connected to the starting treadle foreffecting a I preliminary downward movement of the. presser member andfor withdrawing the locking member upon completion of'su'ch movement, acamon the shaftv for moving the pawl into operative position to effect apressure stroke of the ram, and means for moving the pawl intoinoperative position at the completion of a pressure stroke'of the ram.V In testimony whereof I have signed my name to this specification.

CERTIFICATE OF CORRECTION.

Patent No. 1, 748, 063. Granted February 25, 1930, to

' .OTTO DRECHSLER.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows:' Page 1,line 69, after the word "is" insert the words "rendered still more"; andthat the said Letters Patent should be read with this correction thereinthat the same may conform to the record of the case in the PatentOffice.

Signed and sealed this 9th day of December, A. D. 1930.

, M. J. Moore, (Seal) Acting Commissioner of Patents.

